Task Force Tip's Pressure Relief Valve operates in an adjustment range from 90 to 300 psi (6 to 21 bar) with easy to see increment's of 90, 125, 150, 200, 250 and 300 psi. Each pressure relief valve includes an OFF position. Three pressure relief valve is NFPA 1901-2009 compliant. The aluminum casting is hardcoat anodized, and TFT-powder coat finished inside and out for maximum corrosion protection. For direct use on pump flanges, the TFT pressure relief valve works with Darley, Waterous or Hale bolt hold patterns.